阿雷西博PALFA银道巡天发现的四颗高色散毫秒脉冲星
Four Highly Dispersed Millisecond Pulsars Discovered in the Arecibo PALFA Galactic Plane Survey
摘要：
我们提出了四个高度分散的毫秒双星（MSP）的发现和相位相干定时从阿雷西博PALFA银河平面调查：PSR J1844+0115，J1850+0124，J1900+0308和J1944+2236。这四颗双星中有三颗是与低质量伴星组成的双星系统，它们很可能是白矮星，轨道周期为天。第四颗脉冲星是孤立的。所有四颗双星都有很大的色散（DM > 100 pc cm-3），距离很远（> 3.4 kpc），在1.4 GHz（< 0.2 mJ y）时很微弱，并且完全回收（自旋周期P在3.5和4.9 ms之间）。这三个双星也有非常小的轨道偏心率，正如预期的潮汐循环，完全回收系统与低质量的同伴。这四个特派团的DM/P比率是银河系统外地MSP中最高的。这些发现使PALFA调查中确认的MSP总数达到15个。这些MSPs的发现说明了PALFA在低银河系纬度寻找微弱、遥远的MSPs的能力。这对于准确估计银河系MSP的数量以及平方公里阵列预计可以探测到的MSP数量非常重要。
英文摘要：
We present the discovery and phase-coherent timing of four highly dispersed millisecond pulsars (MSPs) from the Arecibo PALFA Galactic plane survey: PSRs J1844+0115, J1850+0124, J1900+0308, and J1944+2236. Three of the four pulsars are in binary systems with low-mass companions, which are most likely white dwarfs, and which have orbital periods on the order of days. The fourth pulsar is isolated. All four pulsars have large dispersion measures (DM > 100 pc cm-3), are distant (> 3.4 kpc), faint at 1.4 GHz (< 0.2 mJy), and are fully recycled (with spin periods P between 3.5 and 4.9 ms). The three binaries also have very small orbital eccentricities, as expected for tidally circularized, fully recycled systems with low-mass companions. These four pulsars have DM/P ratios that are among the highest values for field MSPs in the Galaxy. These discoveries bring the total number of confirmed MSPs from the PALFA survey to fifteen. The discovery of these MSPs illustrates the power of PALFA for finding weak, distant MSPs at low-Galactic latitudes. This is important for accurate estimates of the Galactic MSP population and for the number of MSPs that the Square Kilometer Array can be expected to detect.
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